Furnace construction



March 5, 1935. A, .SURRY FURNACE CONSTRUCTION Filed Sept. 12, 1932 V INVENTOR Anderson :11?

' ATTORN EY Patented Mar. 5, 1935 PATENT oFFice rUnNAcE CONSTRUCTION v Anderson Surry, Monroe, La., assignor of thirtyone and one-fourth per cent to Charles G.

Bennett, Monroe, La.

Application September 12, 1932, Serial No. 632,818

2 Claims.

M invention relates to improvements in furnace constructions, being particularly applicable to gas and oil fired furnaces and it consists in the combinations, constructions and arrangements herein described and claimed.

An object of my invention is to provide a furnace having an arch disposed therein which tends to direct the products of combustion and to conserve heat in such a manner that the consumption of gas is considerably reduced, thus rendering the furnace very economical.

A further object of the invention is to provide a device of the type described, in which a refractory arch is provided which forms a bafiie for the products of combustion, and against which the blast from the gas or oil burner is directed, this arch being perforated to permit streams of the heated products of combustion to pass upwardly against the boiler while at the same time the arch is itself heated and tends to retain heat that might otherwise be lost.

A further object of the invention is to provide a furnace having an air inlet near the bottom of the furnace, thus tending to keep the bottom cool while at the same time producing convection currents which carry the heat, which would ordinarily be radiated to the bottom, from the heated arch upwardly through and around the arch and into close proximity to the boiler.

A further object of the invention is to provide a device for directing the products of combustion but which takes up relatively little space and therefore permits a reduction in the size of the fire box.

Other objects and advantages will appear in the following specification and the novel features of the invention will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawing forming part of this application, in which:

Figure 1 is a longitudinal sectional view through a furnace, showing one embodiment of the invention.

Figure 2 is a section along the line 2--2 of Fig. l, and,

Figure 3 is an enlarged transverse section through one of the arches.

In carrying out my invention I make use of a base 1 having a rear wall 2, a front wall 3 and a boiler supporting member 4. The boiler 5 rests on the front wall at one end and on the support 4 at the rear end. The space 6 between the boiler and the rear wall constitutes a flue.

A burner 7 of any approved type is arranged to inject gas or other suitable fuel through an opening 33: in the front wall. Below this opening is another opening 311 through which air is admitted.

Within the combustion chamber beneath the boiler 5, is a fire wall 8 and between the fire wall and the front wall 3 is the refractory arch. In the present instance I have shown two of these arches although it is obvious that one or more may be used, depending upon the size of the furnace. Each arch is made up of a series of sections 9 having openings 10. The sectionsare made of refractory material, such as fire clay, and when assembled form a continuous arch with the perforations disposed as shown in the drawing. Each arch is supported by side walls 11, the central wall shown in Fig. 2 being larger than the side walls. The arches are inclined as shown, being tipped at angles varying from 30 to 50 degrees, depending upon the size of the fire box.

From the foregoing description of the various parts of the device the operation thereof may be readily understood. The gas flame 12 is projected through the opening 3x as stated, and impinges upon the arch, thus heating the arch. A portion of the flame and products of combustion pass upwardly through the openings 10 against the bottom of the boiler 5, a portion pass ing around the front in the manner indicated in the drawing. The air coming into the opening 3 supports combustion and at the same time tends to cool the bottom of the furnace while conveying by its movement any heat which would be radiateddownwardly, back against the arch and out through the perforations to the boiler, thereby conserving the heat which might otherwise be wasted.

Without this arch the gas flame would be projected against the fire wall 8 and then upwardly toward the boiler but a good portion of the heat will pass up the flue. The arch tends to retain the heat and to act as a bafiie todeflect the heat and the products of combustion into close proximity to the boiler.

I have found, that with the use of this arch, steam may be raised in the boiler in much less time than in a furnace of similar construction, but where the arch is not used. Furthermore, the use of the arch so conserves the products of combustion that a given amount of steam may be generated with a much less quantity of gas.

I claim:

1. In a furnace construction, a boiler, a combustion chamber beneath the boiler, said combustion chamber having a front wall provided with an air inlet near the bottom of the combustion chamber, a fire wall in said combustion chamber, a burner nozzle for injecting fluid fuel into said combustion chamber, an arch disposed between said fire wall and the burner, for receiving the blast from the burner, said arch being inclined upwardly and forwardly and being spaced from the floor of the furnace at the rear end and having a plurality of refractory perforated sections, and side walls for supporting the arch sections.

2. In a furnace construction, a boiler, a combustion chamber underneath said boiler, said combustion chamber having a rear wall, a floor, and a front wall, said front wall having an air inlet at the floor line, a fire wall disposed between said front wall and said rear wall, a perforated refractory arch in front of said fire wall, said arch being inclined forwardly and upwardly, the rear end of the arch being spaced from the floor, side walls for supporting the arch, and a burner disposed in said front wall and directed toward the arch whereby the fuel blast from the burner is projected directly against the arch.

ANDERSON SURRY. 

